This document discusses copyright knowledge, including that the same copyright laws apply to online content as other media. It notes common misconceptions that everything online is public domain or that postings are always protected. Implied licenses grant limited use rights when content is posted, while express licenses like Creative Commons clarify allowed uses. Fair use allows some educational and scholarly reuse but is unclear, so implied or express licenses are preferable. The TEACH Act provides additional rights for educators to display copyrighted works in classrooms. Getting permission from copyright holders is recommended when possible. Orphan works are copyrighted works whose owners cannot be located, creating risks if the owner emerges.